Dioctyl Sebacate

Dioctyl Sebacate (DOS) is a high-performance cold-resistant plasticizer with the chemical name bis(2-ethylhexyl) sebacate and CAS number 122-62-3. It serves as an excellent diester plasticizer derived from sebacic acid and 2-ethylhexanol, widely used to enhance flexibility and durability in polymers, especially under extreme low-temperature conditions.

What is Dioctyl Sebacate?

Dioctyl Sebacate (DOS) is a colorless to pale yellow, oily liquid with the molecular formula C₂₆H₅₀O₄ and a molecular weight of approximately 426.68 g/mol. It features low volatility, high plasticizing efficiency, and outstanding low-temperature performance. Manufacturers often blend it with other plasticizers like phthalates for balanced properties in demanding applications.

Key physical and chemical properties include:

• Appearance: Clear, transparent oily liquid

• Density: ~0.914 g/cm³ at 25°C

• Melting Point: Approximately -48°C to -55°C

• Boiling Point: ~212°C at 1 mmHg (or 256°C at 0.7 kPa)

• Flash Point: ≥215°C

• Solubility: Insoluble in water; soluble in organic solvents such as ethanol, ether, and acetone

• Refractive Index: 1.450–1.455

These characteristics make DOS stable during high-temperature processing while maintaining excellent flexibility in cold environments.

Key Benefits of Dioctyl Sebacate as a Plasticizer

Dioctyl Sebacate stands out among ester plasticizers due to its superior performance in low-temperature applications:

• Excellent Low-Temperature Flexibility — Maintains pliability and impact resistance down to very low temperatures, outperforming many adipates and standard phthalates.

• Low Volatility — Reduces loss during processing and long-term use, ensuring product stability.

• High Plasticizing Efficiency — Delivers effective softening at lower dosages, improving cost-efficiency.

• Good Heat, Light, and Weather Resistance — Provides strong electrical insulation and resistance to extraction by water, soaps, or detergents.

• Compatibility — Works well with PVC, vinyl chloride copolymers, cellulose resins, synthetic rubbers, and polyurethane systems.

Compared to alternatives like DOA (dioctyl adipate), DOS often offers better long-term stability and lower migration in premium applications.

Main Applications of Dioctyl Sebacate (CAS 122-62-3)

Industries widely apply Dioctyl Sebacate in products requiring cold-weather performance and durability:

• PVC and Polymer Products — Flexible films, sheets, artificial leather, cables, wires, and outdoor products exposed to low temperatures.

• Automotive and Transportation — Interior parts, seals, and hoses that need flexibility in cold climates.

• Synthetic Rubbers and Elastomers — Enhances low-temperature resilience in gaskets, belts, and molded goods.

• Coatings, Adhesives, and Inks — Improves elasticity and flow in polyurethane systems and specialty coatings.

• Lubricants and Specialty Fluids — Used in ester-based engine oils, hydraulic fluids, and as a component in certain brake fluids or model aerosols.

• Other Uses — Plasticizer in explosives (e.g., C-4), cosmetics (as emollient or film former), and medical devices requiring low-temperature performance.

Its non-toxic profile and low migration make it suitable for sensitive applications, including some food-contact compliant formulations.

Technical Specifications (Typical)

• Purity (Ester Content): ≥99.0%–99.6%

• Acid Value: ≤0.1 mg KOH/g

• Moisture: ≤0.1%

• Color (Pt-Co): ≤30

• Kinematic Viscosity: 11–12 mm²/s at 40°C

Custom specifications are available upon request to meet specific industry standards.

Why Choose Dioctyl Sebacate for Your Formulation?

For manufacturers seeking reliable low-temperature performance without compromising on heat stability or electrical properties, Dioctyl Sebacate (DOS, CAS 122-62-3) delivers consistent results. Its combination of low volatility, high efficiency, and excellent compatibility helps produce durable, flexible end products that perform reliably in harsh environments.

Frequently Asked Questions (FAQs)

What is the CAS number for Dioctyl Sebacate? The CAS number is 122-62-3. It is also commonly known as bis(2-ethylhexyl) sebacate or DOS.

Is Dioctyl Sebacate suitable for low-temperature PVC applications? Yes. DOS excels in low-temperature flexibility, maintaining material pliability at temperatures as low as -50°C or below, making it ideal for cold-weather cables, films, and automotive parts.

How does DOS compare to other plasticizers like DOP or DOA? DOS offers superior low-temperature performance and lower volatility than many phthalates (like DOP) and adipates (like DOA). It provides better long-term stability and extraction resistance in many formulations.

Is Dioctyl Sebacate toxic or hazardous? DOS has a low toxicity profile and is generally considered non-hazardous under standard industrial handling. Always follow proper safety precautions, including the use of gloves and eye protection.

Can Dioctyl Sebacate be used in food-contact applications? Certain grades comply with relevant regulations (such as FDA CFR 21 for specific uses). Confirm compliance with your supplier based on the intended application.

What packaging options are available for Dioctyl Sebacate? It is typically supplied in drums, IBC totes, or bulk tankers. Storage should be in cool, dry conditions away from strong oxidizers.

Does DOS have good compatibility with other plasticizers? Yes. It blends effectively with phthalates, adipates, and other esters to optimize cost and performance.

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